Method and Radio Network Node for Enabling Switch of Transmission Mode for a User Equipment

摘要

A method and a radio network node (800) for enabling a switch between transmission modes for sending downlink signals to a User Equipment, UE. A switching unit (800a) selects a first transmission mode when downlink signal quality in the UE is above a switching threshold (Th), and selects a second transmission mode when the downlink signal quality is below the switching threshold. An obtaining unit (800c) obtains a first performance level when the first transmission mode is used and the downlink signal quality is within a specific vicinity range from the switching threshold, and obtains a second performance level when the second transmission mode is used and the downlink signal quality is within the specific vicinity range. An adjusting unit (800d) then adjusts the switching threshold (Th) based on a deviation between the first performance level and the second performance level. Thereby, the adjusted switching threshold may be more or less optimized and used to achieve the best possible performance under the currently prevailing circumstances regardless of the downlink signal quality. (FIG. 8)

主权项

1. A method in a radio network node of a wireless communication network, for enabling a switch between transmission modes used for sending downlink signals to at least one User Equipment, UE, wherein a first transmission mode is used when a quality of downlink signals received by the at least one UE is above a switching threshold and a second transmission mode is used when said quality is below the switching threshold, the method comprising:
obtaining a first performance level pertaining to reception of the downlink signals in the at least one UE when the first transmission mode is used for sending the downlink signals and the quality of downlink signals received by the at least one UE is within a specific vicinity range from the switching threshold, obtaining a second performance level pertaining to reception of the downlink signals in the at least one UE when the second transmission mode is used for sending the downlink signals and the quality of downlink signals received by the at least one UE is within the specific vicinity range from the switching threshold, and adjusting the switching threshold based on a deviation between the first performance level and the second performance level.